/*

 * svc_auth.c, Server-side rpc authenticator interface.

 *

 * Copyright (c) 2010, Oracle America, Inc.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are

 * met:

 *

 *     * Redistributions of source code must retain the above copyright

 *       notice, this list of conditions and the following disclaimer.

 *     * Redistributions in binary form must reproduce the above

 *       copyright notice, this list of conditions and the following

 *       disclaimer in the documentation and/or other materials

 *       provided with the distribution.

 *     * Neither the name of the "Oracle America, Inc." nor the names of its

 *       contributors may be used to endorse or promote products derived

 *       from this software without specific prior written permission.

 *

 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS

 *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE

 *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,

 *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE

 *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

 *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

 *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include <rpc/rpc.h>

#include <rpc/svc.h>

#include <rpc/svc_auth.h>

#include <shlib-compat.h>

/*

 * svcauthsw is the bdevsw of server side authentication.

 *

 * Server side authenticators are called from authenticate by

 * using the client auth struct flavor field to index into svcauthsw.

 * The server auth flavors must implement a routine that looks

 * like:

 *

 *      enum auth_stat

 *      flavorx_auth(rqst, msg)

 *              register struct svc_req *rqst;

 *              register struct rpc_msg *msg;

 *

 */

static enum auth_stat _svcauth_null (struct svc_req *, struct rpc_msg *);

				/* no authentication */

extern enum auth_stat _svcauth_unix (struct svc_req *, struct rpc_msg *);

				/* unix style (uid, gids) */

extern enum auth_stat _svcauth_short (struct svc_req *, struct rpc_msg *);

				/* short hand unix style */

extern enum auth_stat _svcauth_des (struct svc_req *, struct rpc_msg *);

				/* des style */

static const struct

  {

    enum auth_stat (*authenticator) (struct svc_req *, struct rpc_msg *);

  }

svcauthsw[] =

{

  { _svcauth_null },		/* AUTH_NULL */

  { _svcauth_unix },		/* AUTH_UNIX */

  { _svcauth_short },		/* AUTH_SHORT */

  { _svcauth_des }		/* AUTH_DES */

};

#define	AUTH_MAX	3	/* HIGHEST AUTH NUMBER */

/*

 * The call rpc message, msg has been obtained from the wire.  The msg contains

 * the raw form of credentials and verifiers.  authenticate returns AUTH_OK

 * if the msg is successfully authenticated.  If AUTH_OK then the routine also

 * does the following things:

 * set rqst->rq_xprt->verf to the appropriate response verifier;

 * sets rqst->rq_client_cred to the "cooked" form of the credentials.

 *

 * NB: rqst->rq_cxprt->verf must be pre-allocated;

 * its length is set appropriately.

 *

 * The caller still owns and is responsible for msg->u.cmb.cred and

 * msg->u.cmb.verf.  The authentication system retains ownership of

 * rqst->rq_client_cred, the cooked credentials.

 *

 * There is an assumption that any flavour less than AUTH_NULL is

 * invalid.

 */

enum auth_stat

_authenticate (register struct svc_req *rqst, struct rpc_msg *msg)

{

  register int cred_flavor;

  rqst->rq_cred = msg->rm_call.cb_cred;

  rqst->rq_xprt->xp_verf.oa_flavor = _null_auth.oa_flavor;

  rqst->rq_xprt->xp_verf.oa_length = 0;

  cred_flavor = rqst->rq_cred.oa_flavor;

  if ((cred_flavor <= AUTH_MAX) && (cred_flavor >= AUTH_NULL))

    return (*(svcauthsw[cred_flavor].authenticator)) (rqst, msg);

  return AUTH_REJECTEDCRED;

}

libc_hidden_nolink_sunrpc (_authenticate, GLIBC_2_1)

static enum auth_stat

_svcauth_null (struct svc_req *rqst, struct rpc_msg *msg)

{

  return AUTH_OK;

}